<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 消息提示区域 -->
      <el-row>
        <el-col>
          <el-alert
            title="消息提示的文案"
            type="info"
            center
            show-icon
            :closable="false"
          >
          </el-alert>
        </el-col>
      </el-row>
      <!-- 步骤条区域 -->
      <el-row>
        <el-col>
          <el-steps :active="activeIndex - 0" finish-status="success">
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图品"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
          </el-steps>
        </el-col>
      </el-row>

      <!-- tabs区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="tabPosition"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane name="0" label="基本信息">
            <!-- 基本信息表单 -->
            <!-- label看到的表单名称 porp为表单验证规则 -->
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                expand-trigger="hover"
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane name="1" label="商品参数">
            <!-- 渲染item项 -->
            <el-form-item
              :key="item.attr_id"
              v-for="item in manyTableData"
              :label="item.attr_name"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :key="index"
                  v-for="(item1, index) in item.attr_vals"
                  :label="item1"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane name="2" label="商品属性">
            <el-form-item
              :label="item.attr_name"
              :key="item.id"
              v-for="item in onlyTableData"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane name="3" label="商品图片">
            <el-form-item>
              <!-- action上传图片要请求的后台api接口-->
              <!-- on-preview 指定预览的事件 -->
              <!-- list-type 图片列表的呈现方式 -->
              <el-upload
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj"
                :on-success="handleSuccess"
              >
                <el-button size="small" type="primary">点击上传</el-button>
                <div slot="tip" class="el-upload__tip">
                  只能上传jpg/png文件，且不超过500kb
                </div>
              </el-upload>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane name="4" label="商品内容">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      // 控制tabs的显示位置
      tabPosition: 'left',
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详细描述
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的表单验证规则对象
      addFormRules: {
        goods_name: [
          {
            required: true,
            message: '请输入商品名称',
            trigger: 'blur'
          }
        ],
        goods_price: [
          {
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }
        ],
        goods_weight: [
          {
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }
        ],
        goods_number: [
          {
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }
        ],
        goods_cat: [
          {
            required: true,
            message: '请选择商品',
            trigger: 'blur'
          }
        ]
      },
      // 商品分类数据
      cateList: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参数数据列表
      manyTableData: [],
      // 获取静态属性列表
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      // 控制对话框的显示和隐藏
      previewVisible: false
    }
  },
  methods: {
    // 获取所有的商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败')
      }
      this.$message.success('获取商品分类数据成功')
      this.cateList = res.data
    },
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        return (this.addForm.goods_cat = [])
      }
    },
    beforeTabLeave(active, oldActive) {
      if (active !== '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选选择商品分类')
        return false
      }
    },
    // 点击tab标签的时候会触发的事件
    async tabClicked() {
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取列表数据失败')
        }
        this.$message.success('获取列表数据成功')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态属性失败')
        }
        this.$message.success('获取动态属性成功')
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      console.log(file)
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tep_path
      // 2. 充pics数组中找到这个图片对应的索引值
      const index = this.addForm.pics.findIndex(item => {
        return item.pic === filePath
      })
      // 3. 调用数组的splice方法, 把图片从pics数组中移除
      this.addForm.pics.splice(index, 1)
    },
    // 监听图片上传成功后的事件
    handleSuccess(response, file, fileList) {
      console.log(response)
      // 1. 拼接得到一个图片信息对象
      const pinInfo = { pic: response.data.tmp_path }
      // 2. 将图片信息对象, push 到 pics 数组中
      this.addForm.pics.push(pinInfo)
    },
    add() {
      this.$refs.addFormRef.validate(async isPass => {
        if (!isPass) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加的业务逻辑
        // lodash  cloneDeep(obj)深拷贝
        const form = _.cloneDeep(this.addForm)
        console.log(form)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(',')
          }
          this.addForm.attrs.push(newInfo)
        })

        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求添加商品
        // 商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-breadcrumb {
  margin-bottom: 20px;
}

.el-row {
  margin-bottom: 20px;
}

.el-steps {
  padding: 0 60px;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>
